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Changqi Tao,Mengxi Yu 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
In the new era, rapid growth of national economy more and more relies on the transformation of industrial structure. Therefore with the in-depth development of industrialization, a very effective way to make our country more prosperous is optimizing industry structure by integration of informatization and industrialization. In this paper, we create a compound synergetic model and use panel data of Jiangxi Province and the country covering the period 2001-2010 to test order degree of the integration. The main results suggest that promoting the synergy degree of intergration would accelerate the economic development. We should make full use of informatization to promote the synergy degree of informatization with industrialization.
Innovation, Patenting, and International Competitiveness: Empirical Evidence from China
Changqi Wu 서울대학교 경제연구소 1995 Seoul journal of economics Vol.8 No.2
As an integrated part of its overall economic reforms, China's innovation system is apparently becoming increasingly efficient. The orientation of research and development has shifted to activities more applied in nature as reflected in the patent data. Combining this with data measuring China's R&D inputs, we present evidence supporting the hypothesis that the patent production function is characterized by constant returns to scale. Moreover, accumulation of patents, which is the source of intertemporal technology spill-overs, contributes significantly to the creation of new knowledge. Technological capability as measured by the ratio of number of patents to the population of a region appears to correlated with enhanced international competitiveness of the non-state industrial sectors.
Innovation Mechanism Study Based On The Technological Convergence : Implications For IT Enterprises
Ye Xu,Changqi Tao 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.9
Based on redefining the concept of technological convergence, this paper analyzes market demand of convergent products according to the characteristics of technological convergence in IT industry. We define market power as the function of product price and the improvement of convergent product’s performance. We also assume the original technology is symbiotic. Based on the above analysis, the paper modifies the Bass Model and the hypotheses of related models, builds a demand growth model of technological convergent products, and uses this model to analyze and estimate the demand growing of converged products. At last, we discuss the conditions that technological convergence will be successful.
Xiangcheng Wu,Changqi Yan,Zhaoming Meng,Kailun Chen,Shaochuang Song,Zonghao Yang,Jie Yu 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.6
To get an insight into the operating characteristics of the passive residual heat removalsystem of molten salt reactors, a two-phase natural circulation test facility was constructed. The system consists of a boiling loop absorbing the heat from the drain tank, acondensing loop consuming the heat, and a steam drum. A steady-state experiment wascarried out, in which the thimble temperature ranged from 450℃ to 700℃ and the systempressure was controlled at levels below 150 kPa. When reaching a steady state, the systemwas operated under saturated conditions. Some important parameters, including heatpower, system resistance, and water level in the steam drum and water tank wereinvestigated. The experimental results showed that the natural circulation system isfeasible in removing the decay heat, even though some fluctuations may occur in theoperation. The uneven temperature distribution in the water tank may be inevitablebecause convection occurs on the outside of the condensing tube besides boiling withdecreasing the decay power. The instabilities in the natural circulation loop are sensitive toheat flux and system resistance rather than the water level in the steam drum and watertank. RELAP5 code shows reasonable results compared with experimental data.
Direct Power Control of PWM Rectifier With Optimal Duty Ratio Under Unbalanced Network
Yongchang Zhang,Changqi Qu,Zhengxi Li,Yingchao Zhang,Longhan Cao 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Direct power control (DPC) attracted wide attention due to its advantages of simple structure, quick response, strong robustness and elimination of current regulation/PWM blocks. However, conventional table-based DPC cannot work well when grid voltage is unbalanced. This paper proposes an improved DPC by using a new definition of instantaneous reactive power. As a result, the distortion in grid current is eliminated and constant active power and new reactive power are obtained. Neither complicated calculation of power compensation nor positive/negative sequence extraction of grid voltage/current is required. The corresponding switching table suitable to regulate both active power and the new reactive power is established. Furthermore, the concept of duty cycle control is introduced to further improve the steady state performance of conventional DPC. Experimental results are presented to confirm the theoretical study and the effectiveness of the proposed method.
Zonghao Yang,Zhaoming Meng,Changqi Yan,Kailun Chen 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
In the passive residual heat removal system of a molten salt reactor, one of the residual heat removalmethods is to use the thimble-type heat transfer elements of the drain salt tank to remove the residualheat of fuel salts. An experimental loop is designed and built with a single heat transfer element toanalyze the heat transfer and flow characteristics. In this research, the influence of the size of a threelayerthimble-type heat transfer element on the heat transfer rate is analyzed. Two methods are usedto obtain the heat transfer rate, and a difference of results between methods is approximately 5%. The gasgap width between the thimble and the bayonet has a large effect on the heat transfer rate. As the gasgap width increases from 1.0 mm to 11.0 mm, the heat transfer rate decreases from 5.2 kW to 1.6 kW. Inaddition, a natural circulation startup process is described in this paper. Finally, flashing natural circulationinstability has been observed in this thimble-type heat transfer element.
Xu, Anying,Lin, Changqi,Hou, Chengxiang,Zhang, Yuehua,Li, Muwang,Sun, Pingjiang Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.13 No.1
The major dominant fluoride-endurance (Dfe) gene was introduced into the commercial varieties by crossing and pedigree selection to breed silkworm races that could normally develop in the area that polluted by fluoride. After backcrossed for two generations, the Dfe gene was made homozygous, and individuals with good economic characters were selected to generate next generation. After 8 generations of selection, their characters became stable, and the silkworm variety which is resistant to fluoride, Huayuan${\times}$Dongsheng, for spring rearing were bred.
IODINE REMOVAL EFFICIENCY IN NON-SUBMERGED AND SUBMERGED SELF-PRIMING VENTURI SCRUBBER
Ali, Majid,Yan, Changqi,Sun, Zhongning,Gu, Haifeng,Wang, Junlong,Khurram, Mehboob Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.2
The objective of this conducted research is to study the iodine removal efficiency in a self-priming venturi scrubber for submerged and non-submerged operating conditions experimentally and theoretically. The alkaline solution is used as an absorbent, which is prepared by dissolving sodium hydroxide (NaOH) and sodium thiosulphate ($Na2S_2O_3$) in water to remove the gaseous iodine ($I_2$) from the gas. Iodine removal efficiency is examined at various gas flow rates and inlet concentrations of iodine for submerged and non-submerged operating conditions. In the non-submerged venturi scrubber, only the droplets take part in iodine removal efficiency. However, in a submerged venturi scrubber condition, the iodine gas is absorbed from gas to droplets inside the venturi scrubber and from bubbles to surrounding liquid at the outlet of a venturi scrubber. Experimentally, it is observed that the iodine removal efficiency is greater in the submerged venturi scrubber as compare to a non-submerged venturi scrubber condition. The highest iodine removal efficiency of $0.99{\pm}0.001$ has been achieved in a submerged self-priming venturi scrubber condition. A mathematical correlation is used to predict the theoretical iodine removal efficiency in submerged and non-submerged conditions, and it is compared against the experimental results. The Wilkinson et al. correlation is used to predict the bubble diameter theoretically whereas the Nukiyama and Tanasawa correlation is used for droplet diameter. The mass transfer coefficient for the gas phase is calculated from the Steinberger and Treybal correlation. The calculated results for a submerged venturi scrubber agree well with experimental results but underpredicts in the case of the non-submerged venturi scrubber.